Amitanand Aiyer created HBASE-8216:
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Summary: Be able to differentiate Power failures from Rack switch
reboot
Key: HBASE-8216
URL: https://issues.apache.org/jira/browse/HBASE-8216
Project: HBase
Issue Type: Bug
Reporter: Amitanand Aiyer
Assignee: Amitanand Aiyer
Priority: Minor
Fix For: 0.89-fb
The master in 0.89-fb waits for 5-6 mins to check if RS'es become accessible;
when it sees a co-related failure such as a rack-switch-reboot.
The rationale behind doing this is that it is not worth assigning and
reassigning regions -- causing churn, when the rack switch reboots are expected
to heal themselves in 5-6 mins. In earlier deployments, where this feature was
not present, we used to find ourselves in a bad situation for 30mins-1hr.
However, co-related failures also happen when there is a power failure for the
rack. These cases take much longer to heal; so waiting for 5-6 mins is a wasted
effort.
The master should be able to differentiate the two scenario, by checking if
*any* of the RS in the rack is able to communicate. Unless all the servers in
the rack are unaccessible, we should proceed with reassigning the regions.
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